A split AC system is only good if the installer knows what he's doing, if your A/C installation person does not pull a vacuum in the line set before opening the block valves in the condensing unit - your system is fked for sure, the head pressure will be incredibly high overloading the condenser with heat and consequently resulting in loss of cooling on the inner unit.
The line set (pipes) should be bent with a pipe bender or if you need an abrupt 90 degree flush with the wall turn braze a copper elbow to the pipes ideally with nitrogen purging so you dont form black soot in the pipes, Pull a vacuum in the system and make sure it holds, Finally the system running pressures should be checked. All the A/C units in my home in Pakistan were installed by me with additional driers. three of them are Orient (mistu clone) and one branded as Winia (bada$$ 18000 BTU unit with dual run condenser and evaporator and Bristol USA compressor) its a very very heavy duty unit and looks 99% like a Fuji (General) unit and it has zero problems in extreme Karachi heat. - of the three Orients one unit was overcharged with refrigerant when delivered, I had to remove some gas to stablise the pressures - normal installation guy wouldnt care and that would result in loss of cooling or some failure.
Till date all of them are running top notch, every year its a routine to clean out the condenser thoroughly, check and repair the insulation on the lineset.
ALL,,,,,, I MEAN ALL the split A/C installation people I have come across in Pakistan do not even have a gauge manifold - just some hammers, screwdrivers, drill etc. They dont even know that they are supposed to vacuum the lineset. And the general people who buy the AC and have them install it suffer from high bills, replacement of A/C every 3 years etc. - most harm is also done by their so called "servicing" in which tons of moisture get into the system and with no vacuuming etc the already "dirty with air because they did not vacuum the lineset at the first installtion" gas in the external unit gets mixed with even more air and moisture. Ask them of extra driers in the system and they will look at you like you have 2 heads.
I have also met some real lunatics in Pakistan, one person was saying that anytime the split A/C lineset is removed etc, All gas is lost, I was WTF are you on about man, Its basic common sense that the system is pumped down into the condensing unit (hence trapping all gas in the outer unit) before undoing the lineset.
